Kinetics of carbon dioxide, methane and hydrolysis in co-digestion of food and vegetable wastes
Kinetic models which can express the behaviors of hydrolysis and biogas generation more precisely than the conventional models were developed. The developed models were evaluated based on the experimental data of six batch reactors. Anaerobic digestion test was co-digestion of food and vegetable was...
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2018-10-01
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| Series: | Global Journal of Environmental Science and Management |
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| author | D. Pham Van M.G. Hoang S.T. Pham Phu T. Fujiwara |
| author_facet | D. Pham Van M.G. Hoang S.T. Pham Phu T. Fujiwara |
| author_sort | D. Pham Van |
| collection | DOAJ |
| description | Kinetic models which can express the behaviors of hydrolysis and biogas generation more precisely than the conventional models were developed. The developed models were evaluated based on the experimental data of six batch reactors. Anaerobic digestion test was co-digestion of food and vegetable waste with inoculating horse dung by 15% of the total wet weight, at the temperature of 37<sup>o</sup>C. For hydrolysis, the modified model was developed from an original first-order kinetic model. The modified first-order kinetic model was proved to be better than the original one with the hydrolysis rate constant in the range of 0.22-0.34/day and hydrolyzable rate of 0.80 to 0.84. Kinetics of carbon dioxide and methane were developed from a current potential model. The comparison between experimental data and modeling values had the high correlation of determination (0.9918-0.9998) and low root mean square errors (0.08-4.51) indicating the feasibility of the developed model. In which, the evolution of methane showed the rate constant in the range of 0.031-0.039/day. The carbon dioxide from fermentation accounted for 12-44% of the total observed carbon dioxide. Thus, separation of fermentation and methanogenesis by various reactors may reduce the price of methane enrichment significantly. There was a lag time between methanogenesis and fermentation in reactors (λ = 7-11 days). Also, the biogas yield was in the range of 431.6-596.9 Nml/g-VS with the CH<sub>4</sub> concentration of 56.2-67.5%. The best methane yield (393.7 Nml/g-VS) was in a reactor with food waste to the vegetable waste ratio by 1.8:1 (wet basis) and C/N ratio by 25.4. |
| format | Article |
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| institution | Kabale University |
| issn | 2383-3572 2383-3866 |
| language | English |
| publishDate | 2018-10-01 |
| publisher | GJESM Publisher |
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| series | Global Journal of Environmental Science and Management |
| spelling | doaj-art-812826c3b32b48a7bb91fd135cdbf0a42025-02-02T16:50:55ZengGJESM PublisherGlobal Journal of Environmental Science and Management2383-35722383-38662018-10-014440141210.22034/gjesm.2018.04.00232755Kinetics of carbon dioxide, methane and hydrolysis in co-digestion of food and vegetable wastesD. Pham Van0M.G. Hoang1S.T. Pham Phu2T. Fujiwara3Department of Environmental Science, Graduate school of Environmental and Life Science, Okayama University, Tsushima, Kita, Okayama, JapanDepartment of Environmental Technology and Management, National University of Civil Engineering, Hai Ba Trung, Ha Noi, VietnamDepartment of Environmental Science, Graduate school of Environmental and Life Science, Okayama University, Tsushima, Kita, Okayama, JapanDepartment of Environmental Science, Graduate school of Environmental and Life Science, Okayama University, Tsushima, Kita, Okayama, JapanKinetic models which can express the behaviors of hydrolysis and biogas generation more precisely than the conventional models were developed. The developed models were evaluated based on the experimental data of six batch reactors. Anaerobic digestion test was co-digestion of food and vegetable waste with inoculating horse dung by 15% of the total wet weight, at the temperature of 37<sup>o</sup>C. For hydrolysis, the modified model was developed from an original first-order kinetic model. The modified first-order kinetic model was proved to be better than the original one with the hydrolysis rate constant in the range of 0.22-0.34/day and hydrolyzable rate of 0.80 to 0.84. Kinetics of carbon dioxide and methane were developed from a current potential model. The comparison between experimental data and modeling values had the high correlation of determination (0.9918-0.9998) and low root mean square errors (0.08-4.51) indicating the feasibility of the developed model. In which, the evolution of methane showed the rate constant in the range of 0.031-0.039/day. The carbon dioxide from fermentation accounted for 12-44% of the total observed carbon dioxide. Thus, separation of fermentation and methanogenesis by various reactors may reduce the price of methane enrichment significantly. There was a lag time between methanogenesis and fermentation in reactors (λ = 7-11 days). Also, the biogas yield was in the range of 431.6-596.9 Nml/g-VS with the CH<sub>4</sub> concentration of 56.2-67.5%. The best methane yield (393.7 Nml/g-VS) was in a reactor with food waste to the vegetable waste ratio by 1.8:1 (wet basis) and C/N ratio by 25.4.http://www.gjesm.net/article_32755_e7101001acd655c13247d30c1a73e2d6.pdfAnaerobic digestion (AD)Carbon dioxide (CO2)First-order kinetic (FOK)Food waste (FW)Methane (CH4)Modified first-order kinetic (MFK)Vegetable waste (VW) |
| spellingShingle | D. Pham Van M.G. Hoang S.T. Pham Phu T. Fujiwara Kinetics of carbon dioxide, methane and hydrolysis in co-digestion of food and vegetable wastes Global Journal of Environmental Science and Management Anaerobic digestion (AD) Carbon dioxide (CO2) First-order kinetic (FOK) Food waste (FW) Methane (CH4) Modified first-order kinetic (MFK) Vegetable waste (VW) |
| title | Kinetics of carbon dioxide, methane and hydrolysis in co-digestion of food and vegetable wastes |
| title_full | Kinetics of carbon dioxide, methane and hydrolysis in co-digestion of food and vegetable wastes |
| title_fullStr | Kinetics of carbon dioxide, methane and hydrolysis in co-digestion of food and vegetable wastes |
| title_full_unstemmed | Kinetics of carbon dioxide, methane and hydrolysis in co-digestion of food and vegetable wastes |
| title_short | Kinetics of carbon dioxide, methane and hydrolysis in co-digestion of food and vegetable wastes |
| title_sort | kinetics of carbon dioxide methane and hydrolysis in co digestion of food and vegetable wastes |
| topic | Anaerobic digestion (AD) Carbon dioxide (CO2) First-order kinetic (FOK) Food waste (FW) Methane (CH4) Modified first-order kinetic (MFK) Vegetable waste (VW) |
| url | http://www.gjesm.net/article_32755_e7101001acd655c13247d30c1a73e2d6.pdf |
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